CN110655293A - Earthworm reactor with frame composite structure and method for treating sludge by earthworm reactor - Google Patents
Earthworm reactor with frame composite structure and method for treating sludge by earthworm reactor Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an earthworm reactor with a frame composite structure, which comprises a main body frame and a multi-layer reactor box body positioned in the main body frame; the bottom of each layer of the main body framework is provided with a bottom plate, and the reactor box body is movably arranged on the bottom plate of each layer; an aeration pipe and a filtrate collecting pipe are arranged in the reactor box body of each layer; one side of the main body frame is respectively provided with an aeration air supply pipe connected with each layer of aeration pipe and a filtrate collecting pipe connected with each layer of filtrate collecting pipe; the aeration air supply pipe is connected to an external aeration device, and the bottom of the filtrate concentration pipe is connected with an external liquid storage tank. The reactor has short sludge treatment period which can be shortened to 3-5 days, and the earthworms can be thrown once to continuously treat 20 batches or more of sludge, thereby saving a large amount of manpower and material resources. Meanwhile, the collection of the wormcast, the earthworm filtrate, finished earthworms and other products is more convenient, and the problems of odor diffusion and mosquito breeding in the sludge treatment process by the earthworms can be effectively avoided.
Description
Technical Field
The invention relates to a method for sludge treatment and resource utilization, in particular to an earthworm reactor with a frame composite structure and a method for treating sludge by the earthworm reactor.
Background
Along with the development of social economy and urbanization, the number of urban sewage treatment plants is increasing, and the following sludge treatment and disposal problems also become the focus of people's attention. The sludge has high water content and is parasitized with various bacteria, viruses and other harmful microorganisms; meanwhile, heavy metal compounds such as zinc, lead, cadmium, copper and the like are concentrated in the sludge, and the sludge treatment problem is troublesome due to the complex and multiple variability of the sludge structure. At present, the sludge treatment technologies mainly applied at home and abroad comprise landfill, incineration, composting, bioremediation and the like, and the treatment technologies have the characteristics but mostly have the problems of secondary pollution and cost restriction.
With the development of technology, bioremediation methods represented by earthworm treatment technology have become an environmentally-friendly and effective treatment approach. The earthworm treatment technology is utilized to treat the sludge, so that various bacteria and viruses can be inactivated, heavy metal compounds are passivated and solidified, the toxic and harmful effects of the sludge are eliminated, nutrient substances in the sludge can be reserved to the greatest extent, and efficient bio-organic fertilizer earthworm feces is formed under the complex digestion and metabolism action of earthworms. Has higher economic benefit and environmental benefit. However, the traditional earthworm treatment technology generally has the defects of being influenced by temperature, climate, large occupied area, low treatment efficiency, long treatment period, large labor consumption, easy pollution range expansion in the sludge transportation process and the like, so that the large-scale application of the earthworm treatment technology is always limited.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an earthworm reactor with a frame composite structure, which is used for treating sludge by combining the physicochemical property of the sludge, the characteristic of earthworm treatment and the physiological habit of earthworms, and solves the problems of long earthworm treatment period, large occupied area, mosquito breeding, odor and the like in the prior art.
In order to solve the technical problem, the invention discloses an earthworm reactor with a frame composite structure, which comprises a main body frame and a multi-layer reactor box body positioned in the main body frame; the bottom of each layer of the main body frame is provided with a bottom plate, and the reactor box body is movably arranged on the bottom plate of each layer and can be drawn out from the main body frame;
an aeration pipe and a filtrate collecting pipe are arranged in the reactor box body of each layer; one side of the main body frame is respectively provided with an aeration air supply pipe connected with each layer of aeration pipe and a filtrate collecting pipe connected with each layer of filtrate collecting pipe; the aeration gas supply pipe is connected to an external aeration device, the bottom of the filtrate concentration pipe is connected with an external liquid storage tank, and earthworm filtrate generated in the treatment process is collected.
Specifically, the reactor box body comprises a main box body with an opening at the top, and an isolation filter layer, a sand grain supplement layer, an earthworm inhabitation layer, a nutrition supplement layer and a sludge treatment layer which are respectively paved in the main box body from bottom to top; preferably, the aeration pipes of the reactor boxes of each layer are positioned in the earthworm inhabiting layer, and one end of each aeration pipe positioned outside the main box is connected with an aeration air supply pipe; the wall of the aeration pipe in the main box body is provided with an air vent, and the conditions of temperature, humidity, oxygen content and the like in the box body are controlled through the aeration effect; the filtrate collecting pipes of all layers are positioned on the outer wall of the bottom of the isolation filter layer.
Furthermore, baffles capable of sliding up and down are arranged on two sides of the main box body positioned on a sludge treatment layer, corresponding slide rails are arranged on the inner walls of the lower part of the main box body positioned on two sides of the main box body, and the baffles slide up and down along the direction of the slide rails; the bottom of the slide rail is sealed, and the outer walls of two sides of the main box body are provided with screws for fixing the baffle; the screws penetrate through the outer wall of the main box body to contact with the baffle in the slide rail and fix the baffle; and after one treatment period is finished, the baffle is lowered to finish the material taking process, and the baffle is raised to finish the material supplementing process.
Furthermore, a perforated isolation plate is arranged between the nutrition supplementing layer and the sludge treatment layer, the diameter of each hole is 1.5-4.5cm, the number of the holes is 25-85, the sludge treated on the isolation plate is directly scraped out in the material taking process, and the perforations of the isolation plate are convenient for earthworms to move up and down.
Specifically, the height of the main box body is 15-25 cm, the length is 30-70 cm, and the width is 20-60 cm;
the isolation and filtration layer is filled with crushed straws with the thickness of 0.5-2 cm, the sand supplement layer is filled with fine sand with the thickness of 0.5-1.5 cm and the fineness modulus of 2.2 ~ 1.6.6, the earthworm habitat layer is filled with earthworm cast with the thickness of 5-9 cm, the nutrition supplement layer is filled with decomposed cow cast and perishable garbage with the thickness of 0.5-2 cm, and the treated sludge layer is used for adding sludge to be treated and laid with the thickness of 3-10 cm.
Specifically, the height of the main body frame is 100-250 cm, the length is 32-72 cm, the width is 22-62 cm, the main body frame is divided into 5-20 layers, each layer bears one reactor box body, and the height of each layer is 18-30 cm.
The invention further provides a method for treating sludge by adopting the earthworm reactor with the frame composite structure, which comprises the following steps:
(1) putting 1.2-4.5kg of adult Eisenia foetida with a belt into the earthworm habitat bed in each reactor box, culturing for 2-7 days at 18-28 ℃ in a dark place, and spraying water into the reactor box every day to keep the water content of the earthworm habitat bed at 60-80 wt%;
(2) adding a conditioner into the sludge in the sludge storage tank, adding bacterial liquid, uniformly mixing, and decomposing for 12-48 hours;
(3) uniformly paving the thoroughly decomposed sludge obtained in the step (2) on earthworm perching beds in the reactor boxes obtained in the step (1) after the culture is finished;
(4) placing each reactor box body into the main body frame respectively, and communicating an aeration gas supply pipe and a filtrate concentration pipe in sequence; starting aeration to perform sludge treatment for one period;
(5) after the sludge in each reactor box body is completely converted into wormcast, taking out each reactor box body, scraping and collecting the sludge treated in each reactor box body and the surface layer earthworms, and supplementing the sludge to be treated for the treatment of the sludge in the next period;
(6) and scraping the collected treatment product, separating wormcast and finished earthworms by using a screen, recycling a part of the separated wormcast as a new conditioner, and storing the rest wormcast and finished earthworms as products in a centralized manner.
Further, because earthworms in the reactor are easy to breed close to each other in the reactor to cause the earthworm degradation, the method also comprises the step (7): and after 20 continuous treatment cycles are finished, 0.1-0.35 kg of rejuvenated earthworms are added into each reactor box body, and the rejuvenated earthworms are added to provide foreign genes for the earthworm population in the reactor so as to keep the earthworm population activity in the reactor.
Specifically, in the step (2), the sludge is municipal sludge with the water content of 75-90 wt%; the conditioner is a mixture of crushed straws and wormcast, the adding amount of the crushed straws is 3-7% of the mass of the sludge, the wormcast is the wormcast obtained in the step (6), the water content is 40% -60%, the carbon-nitrogen ratio (C/N) is 7.5-12.5, and the adding amount of the wormcast is 10-25% of the mass of the sludge; the bacteria liquid is earthworm filtrate collected from a filtrate collecting pipe.
The addition of the conditioner for adjusting the water content, the porosity and the palatability of the sludge and the earthworms is an essential step of pretreatment. The crushed straws can provide more attachment surfaces for the earthworm to move, increase the oxygen content and improve the sludge structure, and are more favorable for the earthworm to eat the sludge. The material structure of the wormcast and the microbial population type contained in the wormcast are the most favorite and most suitable for the earthworms to live, so that the recycled wormcast is selected as a conditioner, the palatability of the sludge can be improved, the adaptation time of the earthworms contacting the sludge is shortened, the harm of toxic substances in the sludge to the earthworms is reduced, the treatment efficiency is improved, and the death rate of the earthworms is reduced.
Earthworm filtrate collected in the earthworm composting process contains a large amount of nutrient substances and microbial populations, the earthworm filtrate generated in the collection treatment process replaces the traditional microbial inoculum to carry out earthworm fermentation and decomposition, the speed is high, the palatability of decomposed sludge and earthworms is better, the earthworm contact adaptation time can be reduced, the earthworm treatment efficiency is improved, and meanwhile, the cost of the microbial inoculum can be saved.
In the step (3), the thickness of the decomposed sludge spread is 3-10 cm. The thickness of the spread mud is not too thick or too thin, and the spread mud can obstruct air to reduce the oxygen content in the compost bin and further influence the treatment efficiency; if the spread sludge is too thin, the sludge is periodically treated, more time is wasted for collecting and replenishing the sludge, and the overall treatment efficiency is reduced.
In the step (4), the aeration adopts an intermittent aeration mode, the aeration rate is 0.03-0.15L/Min, and the aeration is stopped for 3 hours after 30 minutes. The mode of the interval aeration can reduce the influence of the aeration on the earthworm movement under the condition of supplementing oxygen in the compost box on the maximum layer degree.
Has the advantages that:
1. the framework composite structure of the invention has reasonable structure and small floor area (the floor area of 100t/d processing scale is only 800 m)2Compared with the traditional field culture mode, the area occupied is reduced by dozens of times), the operation is simple, and the construction cost and the treatment cost are far lower than those of other sludge treatment processes. A large amount of finished earthworms, high-quality earthworm cast organic fertilizer and earthworm filtrate are produced; wide application range, good economic, environmental and social benefits.
2. The method adopted by the invention has short sludge treatment period which can be shortened to 3-5 days, which is 1/5-1/10 of the time required by the traditional earthworm sludge treatment method. And the earthworms are thrown once to continuously treat 20 batches or more of sludge, so that a large amount of manpower and material resources are saved. Meanwhile, the collection of the wormcast, the earthworm filtrate, finished earthworms and other products is more convenient, and the problems of odor diffusion and mosquito breeding in the sludge treatment process by the earthworms can be effectively avoided.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the earthworm reactor with a frame composite structure.
FIG. 2 is a schematic view of the structure of each reactor box of the present invention.
Wherein each reference numeral represents: 1 a main body frame; 2, a bottom plate; 3, a reactor box body; 31 a main box body; 32 an isolation filter layer; 33 a sand supplement layer; 34 earthworm inhabiting layer; 35 a nutrient supplement layer; 36 treating the sludge blanket; 37 baffle plate; 38 slide rails; 39 screws; 4, an aeration pipe; 5, collecting the filtrate; 6, aerating a gas supply pipe; 7, a filtrate collecting pipe; 8 universal wheels.
Detailed Description
The invention will be better understood from the following examples.
The structures, proportions, and dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the skilled in the art. In addition, the terms "upper", "lower", "front", "rear" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
Example 1
The invention adopts the earthworm reactor with the frame composite structure as shown in figure 1 to treat the sludge. The earthworm reactor with the frame composite structure comprises a main body frame 1 and a multi-layer reactor box body 3 positioned in the main body frame 1; the bottom of each layer of the main body frame 1 is provided with a bottom plate 2, and the bottom of the main body frame 1 is provided with a universal wheel 8; the reactor tank 3 is movably disposed on the floor 2 of each floor and can be drawn out from the main body frame 1. The main body frame 1 has a length of 52cm, a width of 44cm and a height of 230cm, and has 15 layers, each layer having a height of 15 cm. The main body frame 1 can carry 15 reactor boxes 3 (standardized earthworm composting box) and the floor area is about 0.23m2。
An aeration pipe 4 and a filtrate collecting pipe 5 are arranged in the reactor box 3 of each layer; an aeration air supply pipe 6 connected with each layer of aeration pipe 4 and a filtrate concentration pipe 7 connected with each layer of filtrate collection pipe 5 are respectively arranged on one side of the main body frame 1; the aeration gas supply pipe 6 is connected to an external aeration device, the bottom of the filtrate concentration pipe 7 is connected with an external liquid storage tank, and earthworm filtrate generated in the treatment process is collected. The aeration pipes 4 of each layer are positioned in the earthworm inhabiting layer 34, and one end of each aeration pipe positioned outside the main box body 31 is connected with the aeration air supply pipe 6; the wall of the aeration pipe 4 in the main box 31 is provided with an air vent, and the conditions of temperature, humidity, oxygen content and the like in the box are controlled through aeration; the filtrate collecting pipes 5 of each layer are positioned on the outer wall at the bottom of the isolation and filtration layer 32.
As shown in fig. 2, the reactor tank 3 includes a main tank 31 having an open top, and an isolation filter layer 32, a sand supplement layer 33, an earthworm habitat layer 34, a nutrient supplement layer 35, and a treated sludge layer 36 which are laid in the main tank 31 from bottom to top. The main box 31 has a height of 12 cm, a length of 50 cm and a width of 40 cm. The isolation filter layer is filled with crushed straws with the thickness of 2 cm. The sand supplementing layer is filled with fine sand with the thickness of 0.5 cm. The earthworm inhabiting layer is filled with 6 cm of earthworm cast and is produced by mixing the earthworm cast with cow cast and straw for composting. The nutrition supplementing layer is provided with decomposed cow dung and easily-decomposed garbage with the thickness of 1 cm.
The two sides of the main box body 31, which are positioned on the sludge treatment layer 36, are provided with baffle plates 37 capable of sliding up and down, the inner walls of the lower part, which are positioned on the two sides of the main box body 31, are provided with corresponding slide rails 38, and the baffle plates 37 slide up and down along the directions of the slide rails 38; the bottom of the slide rail 38 is sealed, and the outer walls of two sides of the main box body 31 are provided with screws 39 for fixing the baffle 37; the screws 39 penetrate through the outer wall of the main box body 31 to contact with the baffle 37 in the slide rail 38 after being screwed down, and the baffle 37 is fixed; and after one treatment period is finished, the baffle is lowered to finish the material taking process, and the baffle is raised to finish the material supplementing process. An isolating plate with holes is arranged between the nutrition supplementing layer 35 and the sludge treatment layer 36, the treated sludge on the isolating plate is directly scraped out in the material taking process, and the isolating plate with holes is convenient for earthworms to move up and down.
Adopt above-mentioned frame composite construction earthworm reactor to handle some municipal sludge, the concrete step is: 2kg of adult Eisenia foetida with the red band is put into the earthworm inhabiting bed in each standardized earthworm composting box, and the earthworm inhabiting bed is cultured for 3 days under the condition of being placed at 18-28 ℃ and being protected from light, and water is sprayed on the surface of the earthworm inhabiting bed every day during the period to keep the humidity. Adding a conditioner into municipal sludge with the water content of 87% to pulverize straws and wormcast, wherein the adding amount is 5% and 15% of the weight of the sludge to be treated respectively, adding bacterial liquid prepared by processing earthworm percolate, mixing uniformly, and decomposing for 24 hours. And (3) uniformly spreading the thoroughly decomposed sludge on an earthworm inhabiting bed in a standard earthworm composting box, wherein the thickness of the spread sludge is 5 cm. And putting all the standardized earthworm composting boxes into the main body frame, communicating the aeration gas supply pipe and the filtrate concentration pipe, starting aeration by opening an aeration switch, and carrying out sludge treatment for one period. After 4 days, the sludge in the standardized earthworm composting box is completely converted into earthworm cast, the standardized earthworm composting box is taken out, and baffles at two sides of the standardized earthworm composting box are lowered to scrape and collect the treated sludge through a material taking window. After the baffle plate is lifted and new sludge to be treated is added, the standardized earthworm composting box is put back into the main body frame and communicated with a pipeline to start sludge treatment in the next period. And separating the wormcast and finished earthworm products from the scraped and treated sludge through a screen. The separated wormcast part is recycled as a new conditioner, and the residual wormcast and finished earthworms are stored in a centralized way as products.
After a total of 7 cycles of sludge treatment, it was found that the time required for a single treatment cycle was substantially stable for 3-4 days with a sludge thickness of 5 cm. The volume of the sludge is reduced by 32.7 to 40.8 percent after the sludge is completely converted into wormcast. The water content is reduced from 87% to 61%, and the organic matter content is reduced from 45.1% to 38.6%. 46.5kg-56.3kg of wormcast can be collected when the mass of the sludge added in each period is 100kg, 23kg of earthworms with various sizes are collected when the total mass of wormcast produced in seven periods is 47% of the mass of the sludge, and 6.7kg of adult earthworms are collected. 1.3L of earthworm filtrate is collected.
The wormcast, the air-dried and ground pure sludge and the paddy field soil obtained in the embodiment are used as culture substrates for potted research of the pakchoi, the pakchoi is selected from Shanghai green commonly used in Jiangzhe area, and the result shows that the pure sludge has a certain effect of inhibiting the growth of the pakchoi compared with the paddy field soil and can possibly cause the accumulation of heavy metals in the pakchoi. The wormcast respectively improves the yield of the overground parts of the pakchoi by 132.4 percent, and has no obvious heavy metal accumulation phenomenon, and the wormcast treated by the method can be used as a culture medium for plant growth.
Example 2
The frame composite structure earthworm reactor used was the same as in example 1. Adopt above-mentioned frame composite construction earthworm reactor to handle some municipal sludge, the concrete step is:
2kg of adult Eisenia foetida with the red band is put into the earthworm inhabiting bed in each standardized earthworm composting box, and the earthworm inhabiting bed is cultured for 3 days under the condition of being placed at 18-28 ℃ and being protected from light, and water is sprayed on the surface of the earthworm inhabiting bed every day during the period to keep the humidity. Adding conditioner A for crushing straws and wormcast, B for crushing straws and cow dung, C for crushing straws and perishable garbage and D for crushing straws and blue-green algae into 4 parts of municipal sludge with the water content of 87%, wherein the added amount is 5% and 15% of the weight of the sludge to be treated respectively, adding bacterial liquid prepared by processing earthworm leachate, uniformly mixing, and decomposing for 24 hours. And (3) uniformly spreading the thoroughly decomposed sludge on earthworm inhabiting beds in 4 groups of standardized earthworm composting boxes respectively, wherein the thickness of the spread sludge is 5 cm. And putting all the standardized earthworm composting boxes into the main body frame, communicating the aeration gas supply pipe and the filtrate concentration pipe, starting aeration by opening an aeration switch, and carrying out sludge treatment for one period. And (3) completely converting the sludge in the standardized earthworm composting box into earthworm feces, taking out the standardized earthworm composting box, and lowering the baffles on two sides of the standardized earthworm composting box to scrape and collect the treated sludge through the material taking window. After the baffle plate is lifted and new sludge to be treated is added, the standardized earthworm composting box is put back into the main body frame and communicated with a pipeline to start sludge treatment in the next period.
Under the condition that the thickness of spread mud is 5cm, the time required for conditioning a single treatment cycle of the mud by using C crushed straws and easily-rotting garbage and D crushed straws and blue-green algae as conditioners is basically 9-13 days, the number of the earthworm cocoons harvested in the single standardized earthworm composting box in the single cycle is 2, the mass of the harvested earthworms is 0.21, and the average mass of the harvested earthworms is 2.58 g.
The time required for conditioning a single sludge treatment cycle by using the B crushed straws and the cow dung as a conditioner is basically 7-9 days, the number of the harvested earthworm cocoons in a single standardized earthworm composting box in the single cycle is 21, the mass of the harvested earthworms is 0.17, and the average mass of the harvested earthworms is 1.64 g.
The time required for conditioning a single sludge treatment cycle by using the A crushed straws and the earthworm cast as a conditioner is basically 3-4 days, the number of the earthworm cocoons harvested in a single standardized earthworm composting box in the single cycle is 18, the mass of the harvested earthworms is 0.36kg, and the average mass of the earthworms is 3.62 g.
Obtain after the contrast, use and smash back straw and earthworm excrement and can improve the efficiency that the earthworm handled mud greatly and shorten the processing cycle as the conditioner, use rubbing crusher straw and earthworm excrement to take care of more and the medium and large-size ratio of earthworm that mud output as the conditioner simultaneously, can produce bigger economic benefits.
The present invention provides a method and a system for treating sludge in a frame composite structure earthworm reactor, and a method thereof, and a method for implementing the technical scheme is numerous, and the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should be considered as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The earthworm reactor with the frame composite structure is characterized by comprising a main body frame (1) and a multilayer reactor box body (3) positioned in the main body frame (1); the bottom of each layer of the main body frame (1) is provided with a bottom plate (2), and the reactor box body (3) is movably arranged on the bottom plate (2) of each layer and can be drawn out from the main body frame (1);
an aeration pipe (4) and a filtrate collecting pipe (5) are arranged in the reactor box body (3) of each layer; an aeration air supply pipe (6) connected with each layer of aeration pipe (4) and a filtrate concentration pipe (7) connected with each layer of filtrate collection pipe (5) are respectively arranged on one side of the main body frame (1); the aeration air supply pipe (6) is connected to an external aeration device, and the bottom of the filtrate concentration pipe (7) is connected with an external liquid storage tank.
2. The earthworm reactor with a frame composite structure according to claim 1, wherein the reactor tank (3) comprises a main tank (31) with an open top, and an isolation filter layer (32), a sand supplement layer (33), an earthworm inhabitation layer (34), a nutrition supplement layer (35) and a sludge treatment layer (36) which are respectively laid in the main tank (31) from bottom to top; the aeration pipes (4) of each layer of reactor box body are all positioned in the earthworm inhabiting layer (34), and one end of each aeration pipe positioned at the outer side of the main box body (31) is connected with the aeration gas supply pipe (6); the wall of the aeration pipe (4) positioned in the main box body (31) is provided with a vent hole; the filtrate collecting pipes (5) of all layers are positioned on the outer wall of the bottom of the isolation and filtration layer (32).
3. The earthworm reactor with a frame composite structure according to claim 2, wherein the main tank body (31) is provided with baffles (37) capable of sliding up and down on two sides of a processed sludge layer (36), and corresponding slide rails (38) are arranged on the inner walls of the lower part of the main tank body (31) on two sides; the bottom of the sliding rail (38) is sealed, and the outer walls of two sides of the main box body (31) are provided with screws (39) for fixing the baffle (37); and the screws (39) penetrate through the outer wall of the main box body (31) to contact with the baffle (37) in the slide rail (38) after being screwed down and fix the baffle (37).
4. The earthworm reactor with a frame composite structure according to claim 3, wherein a perforated partition plate is arranged between the nutrition supplementing layer (35) and the processed sludge layer (36), the diameter of the perforated partition plate is 1.5-4.5cm, and the number of the perforated partition plate is 25-85.
5. The earthworm reactor with a frame composite structure according to claim 2, wherein the main tank body (31) has a height of 15-25 cm, a length of 30-70 cm and a width of 20-60 cm;
the isolation filter layer (32) is filled with crushed straws with the thickness of 0.5-2 cm, the sand supplement layer (33) is filled with fine sand with the thickness of 0.5-1.5 cm and the fineness modulus is 2.2 ~ 1.6.6, the earthworm habitat layer (34) is filled with earthworm cast with the thickness of 5-9 cm, the nutrition supplement layer (35) is filled with decomposed cow cast and perishable garbage with the thickness of 0.5-2 cm, and the treated sludge layer (36) is used for adding sludge to be treated and laid with the thickness of 3-10 cm.
6. The earthworm reactor with the frame composite structure as claimed in claim 1, wherein the main body frame (1) is 250 cm high, 32-72 cm long and 22-62 cm wide, and is divided into 5-20 layers, each layer carries one reactor box (3), and each layer is 18-30 cm high.
7. The method for treating sludge by using the earthworm reactor with the frame composite structure as claimed in claim 1, which is characterized by comprising the following steps:
(1) putting 1.2-4.5kg of adult Eisenia foetida with a belt into the earthworm habitat bed in each reactor box body (3), culturing for 2-7 days at 18-28 ℃ in a dark place, and spraying water into the reactor box body (3) every day to keep the water content of the earthworm habitat bed at 60-80 wt%;
(2) adding a conditioner into the sludge in the sludge storage tank, adding bacterial liquid, uniformly mixing, and decomposing for 12-48 hours;
(3) uniformly paving the thoroughly decomposed sludge obtained in the step (2) on earthworm perching beds in the reactor boxes (3) after the culture in the step (1) is finished;
(4) each reactor box body (3) is respectively placed in the main body frame (1) and is sequentially communicated with an aeration gas supply pipe (6) and a filtrate concentration pipe (7); starting aeration to perform sludge treatment for one period;
(5) after the sludge in each reactor box body (3) is completely converted into wormcast, taking out each reactor box body (3), scraping and collecting the sludge treated in each reactor box body (3) and the surface layer earthworms, and supplementing the sludge to be treated for treating the sludge in the next period;
(6) and scraping the collected treatment product, separating wormcast and finished earthworms by using a screen, recycling a part of the separated wormcast as a new conditioner, and storing the rest wormcast and finished earthworms as products in a centralized manner.
8. The method for treating sludge according to claim 7, further comprising the step (7): after 20 continuous treatment cycles are finished, 0.1-0.35 kg of rejuvenated earthworms are added into each reactor box body (3).
9. The method for treating sludge according to claim 7, wherein in the step (2), the sludge is municipal sludge with a water content of 75-90 wt%; the conditioner is a mixture of crushed straws and wormcast, the adding amount of the crushed straws is 3-7% of the mass of the sludge, the wormcast is the wormcast obtained in the step (6), the water content is 40% -60%, the carbon-nitrogen ratio is 7.5-12.5, and the adding amount of the wormcast is 8-35% of the mass of the sludge; the bacteria liquid is earthworm filtrate collected from a filtrate collecting pipe.
10. The method for treating sludge according to claim 7, wherein in the step (4), aeration is performed by intermittent aeration at an aeration rate of 0.03 to 0.15L/Min, and aeration is stopped for 3 hours per 30 minutes of aeration; one cycle of sludge treatment is 3-5 days.
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| US16/881,439 US11091382B2 (en) | 2019-10-18 | 2020-05-22 | Earthworm reactor of frame composite structure and method of treating sludge thereby |
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